NEW SRAM XX1 Eagle XG-1299 12-Speed Cassette 12-Speed, 10-50t, Copper Type_Brake Rotors this derailleur stands up to

this derailleur stands up to hard impacts and still retains its lightning-quick shifting performance

its full X-Sync design literally means the harder you pedal

Two fully sealed bearings

Kashima Coating on upper tubes for added durability

NEW SRAM XX1 Eagle XG-1299 12-Speed Cassette 12-Speed, 10-50t, Copper Type_Brake Rotors this derailleur stands up toSRAMs cassette manufacturing technology provides the greatest durability and lightest weight All new shifting features create a smoother, quieter system with enhanced inboard and outboard shift performance XD driver body compatible SRAM Model ID: CS XG 1299 B1 Range: 1050T Speed: 12 Cassette freehub compatibility: SRAM XD 11 12 Speed Cassette weight: 300g Cog details: 10 12 14 16 18 21 24 28 32 36 42 50 Finish: Copper Cassette spider material: Steel